Near-infrared observations of Sagittarius A*

Details Near-infrared observations of Sagittarius A* Near-infrared observations of Sagittarius A*

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008rmxac..32...12t&link_type=abstract

The Nuclear Region, Host Galaxy and Environment of Active Galaxies (Eds. Erika Benítez, Irene Cruz-González, & Yair Krongold) Re

Physics

Black Hole Physics, Accretion, Accretion Discs, Galaxy: Centre

Scientific paper

We present and discuss recent near infrared observations of Sagittarius A*, the supermassive black hole in the centre of our Galaxy. Since 2003 this source has been observed photometrically, polarimetrically, and spectroscopically in H, K and L bands (1.5-4.1mum). The emission shows up in form of outbursts occuring few times per day and lasting typically 1-3 hours. These ``flares'' show quasi-periodic sub-structures at timescales of ˜15 minutes. They are significantly polarised and show a variable spectral colour index. All in all, the observations point towards decaying plasma hotspots orbiting the black hole on relativistic orbits as a source of NIR synchrotron emission.

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